Garmin GNC 255 Pilot's Manual

Also see for GNC 255: Installation manual

Contents

Garmin GNC 255 Pilot's Manual Manual pdf 56 page image

4-4Garmin GNC 255A/255B Pilot’s Guide 190-01182-01 Rev. A4.3 MessagesWhen a Message has been issued by the unit, the Message will be shown onthe display. After viewing the messages, touch the ENT key to acknowledge themessage and return to the previously viewed page. An acknowledged messagewill not be redisplayed even if the condition persists. Messages provide an aid totroubleshooting system operation.MessagePress ENT ToAcknowledgeFigure 4-1 Message - Com PTT Key StuckMessage Description ActionCOM RADIO -Com radio needsservice.The com radio isreporting that it needsservice. The com radiomay continue tofunction.Cycle the power to the COM radio.Contact dealer for service.COM RADIO -Com radio may beinoperative.The com radio is notcommunicating properlywith the system.Press and hold the volume knob orthe external com remote transfer(COM RMT XFR) switch, if installed– this will force the com radio to121.5 MHz. Contact dealer forservice.COM RADIO -Com overtempor undervoltage.Reducingtransmitter power.Com radio isin overtemp orundervoltage modeand transmitting powerhas been reduced toprevent damage to thecom radio. Radio rangewill be reduced.Decrease length of comtransmissions, decrease cabintemperature and increase cabinairflow (especially near the GTN).Check aircraft voltage and reduceelectrical load as necessary.Contact dealer for service if thismessage persists.COM RADIO -Com locked to121.5 MHz. Holdremote comtransfer key to exit.Com radio is locked to121.5 MHz.The external com remote transfer(COM RMT XFR) switch has beenheld and the com radio is tuned to121.5. To exit this mode, hold thecom remote transfer (COM RMTXFR) switch for two seconds.